Extreme Heat Warning: Kofa; Yuma; Central La Paz; Gila River Valley; Chuckwalla Mountains; Imperial County Southeast; Chiriaco Summit

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Extreme Heat Warning — Kofa; Yuma; Central La Paz; Gila River Valley; Chuckwalla Mountains; Imperial County Southeast; Chiriaco Summit Severity: Severe. Certainty: Likely. * WHAT...Dangerously hot conditions. Afternoon temperatures 109 to 116. Major Heat Risk. Overexposure can cause heat cramps and heat exhaustion to develop and, without intervention, can lead to heat stroke. * WHERE...In Arizona, Central La Paz, Gila River Valley, Kofa, and Yuma. In California, Chuckwalla Mountains, Imperial County Southeast, and Chiriaco Summit. * WHEN...Until 8 PM MST /8 PM PDT/ Thursday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. Overexposure can cause heat cramps and heat exhaustion to develop and, without intervention, can lead to heat stroke.